Windows Phone 8.1 Cortana WiFi problem.

I've had the Windows Phone 8.1 beta since it was released and I've had no problem except for one. Cortana doesn't seem to work while I have my Wi-Fi connected and I can't seem to figure out why. It works on my regular data connection perfectly. Whenever I try to use it on WiFi I can use regular commands to set reminders, call people and text people but I can't do anything other than that because it always says interest aren't available. Someone please help.